Is OpenStack a public or private cloud?

Related questions

1. Why is an app better than a website?
2. What can I do with OpenStack?
3. What is difference between AWS and OpenStack?
4. Is OpenStack an operating system?
5. Is OpenStack a hypervisor?
6. Is ownCloud open source?
7. How do you use cloud computing?
8. What is the cloud internet?
9. What is Cloudstack vs OpenStack?
10. Who started openstack?

Tags

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2. #cloud
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5. #presents
6. #providers
7. #debate
8. #amazon
9. #public
10. #viable
11. #share
12. #private
13. #others
14. #trodden
15. #market
16. #openstack
17. #microsoft
18. #google
19. #among